If your opponent can defeat just one of these Pokmon, they're already halfway to winning the game
Whether you play one, the other, or both, your Adventure deck is very likely to be aggressive at least all the current builds are and its going to be more resilient than most aggro decks, because both the build-arounds provide card advantage and the Adventure mechanic is in itself a source of it
Sen Triplets is specific in the decks that can play it, but being able to ensure someone that can interact with you can't makes it a worthwhile inclusion outside of the command zone
Tarmogoyf Nest Its Squirrel Nest, but for Tarmogoyf tokens
There're my Top 5 Five-Color Support spells
When you see that [[Anafenza, the Foremost]] is a 4/4 for [[symbol:3]] manas with nice abilities and offers 3 colors [[symbol:B]][[symbol:W]][[symbol:G]] without being T1, it's easy to understand that a 2/4 for [[symbol:3]] manas in the worst color combination of the format (simic : [[symbol:U]][[symbol:G]]) forcing us to play tribe will never be T1